Antarctic radioactive dating of meteorites
Each person is armed with a survival kit, meteorite gathering equipment, lots of water and food, medical kits, Iridium satellite phones and GPS devices.Once a sample is spotted, scientists assign it an identification number.They establish its position with GPS and note the specimen's size, possible classification and any distinguishing features such as shape or fusion crust.Researchers then collect the sample in a sterile Teflon bag, taking care to avoid contact with any mechanical or biological materials.They appear to consistently yield 4.55–4.57 Ga radioisotope ages, adding to the uniformitarians’ confidence in the radioisotope dating methods. Many radioisotope dating studies of groups of asteroidal meteorites (chondrites, stony achondrites, pallasites and mesosiderites, and irons) in the last six decades have used the Rb-Sr, Sm-Nd, U-Th-Pb, Lu-Hf, Re-Os, Mn-Cr, and Hf-W methods to yield many isochron ages of groups of these meteorites from whole-rock samples, and mineral and other fractions. Yum." In another dispatch from the ice, Schrader reported: "It was a special day for us because we collected our first meteorites.
I think we all feel that we hit the jackpot today, and we are so happy that we moved camp. Leonard David has been reporting on the space industry for more than five decades.
A gang of heavily insulated scientists has wrapped up its Antarctic expedition, with its members thawing out from the experience, but pleased to have bagged more than 300 space rocks.
They are participants in the Antarctic Search for Meteorites program, or ANSMET for short.
While the field season was in progress, these samples were inventoried and kept frozen.
Upon the team's return to Mc Murdo Station, the U. scientific headquarters in the Antarctic, the meteorites were transferred to special shipping containers and sent, still frozen, to the Antarctic Meteorite Curation Facility at the Johnson Space Center in Houston.